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Author Prasad, C. D. ♦ Chandrasekhar, T. ♦ Desai, J. N. ♦ Ashok, N. M. ♦ Sivaraman, K. R. ♦ Rajmohan, R.
Source Indian Institute of Astrophysics
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics
Subject Keyword Amines ♦ Emission Spectra ♦ Halley's Comet ♦ Line Shape ♦ Oxygen Spectra ♦ Astronomical Spectroscopy ♦ H Alpha Line
Description The forbidden O I line and NH2 (0-8-0) emissions of Comet Halley at about 6300 A were observed during April 1986 using a Fabry-Perot spectrometer with a resolution of about 0.14 A. The forbidden O I line and NH2 rotational lines were spectrally well separated by the interferometer and a NH2/O I ratio of about 0.5 was found. The profile analysis shows the profiles of forbidden O I line and NH2 to be symmetric with linewidths of about 3.5-3 km/s. The cometary Balmer emission of hydrogen at 6563 A was barely detectable. An upper limit for H(alpha) based on the instrumental sensitivity yields a value of 30 Rayleighs.
ISSN 00046280
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Institution Astronomical Society of the Pacific
Starting Page 1